Shuttle for sewing-machines



W D'UGHEMIN SHUTTLE FOR SEWING MACHINES.

No. 459,814. Patented Sept. 22, 1891.

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FFICEQ \VILLIAM DUCHEMIN, OF NEWBURYPORT, MASSACHUSETTS, ASSIGNOR OFONE-HALF TO HENRY XV. BLAIR, OF MANCHESTER, NEV HAMPSHIRE.

SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 459,814, datedSeptember 22, 1891.

Application filed August 4,1890- Serial No- 360,956- (No model.)

T aZZ whom it may concern:

Be it known that 1, WILLIAM DUCHEMIN, a subject of the Queen of England,residing at 'Newburyport, in the county of Essex and State ofMassachusetts, have invented certain new and useful Improvements inSewing-Machine Shuttles; and'I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers [0 skilled in the art 'to which it appertains to make and use thesame.

My invention relates to improvements in metal shuttles used insewing-machines, and especially adapted for that class in which the r 5stitches range from those required for domestic purposes to stitches oftwo or more inches in length; and the objects of my improvements are toprovide a shuttle therefor of'such construction that cops from which thethread is discharged from the interior can be used therein; also, toprovide a tension therefor of such a nature that the thread will be freefrom tension at all times, except at the finish of the stitch. I attainthese objects by the mechanism illustrated in the accompanying drawings,in Which Figure l is aperspect-ive of the back of the shuttle, showingthe mode of threading the same; Fig. 2, a perspective of the front ofthe 0 shuttle, showing the cop in position therein and having a part ofthe case broken out; Fig. 3, a perspective of the cop; Fig. 4, acrosssection of the same, showing the interior of the central vent; Fig.5, front elevation of a 5 shuttle having the ordinary bobbin therein;and Fig. 6, aplan of the front disk of the cop, showing the mode ofsecuring said disk to the shell of the case.

Similar letters referto similar parts through-' 40 out the severalviews.

S, Fig. 2, represents the shuttle, which is made in the form of theordinary open shuttle, and is provided at the heel with a hole 8 thatextends from the interior through the side surface of the shuttle, ashort distance in advance of which is aslot sflbetween which and theshoulder s of the thread-guard s is a series of holes a, the first hole8' being placed about mid-length of the interior of the shuttle. Thethread-guard s is made in a different form from the guards used atpresent on this class of shuttles, which taper gradually narrower to therear, as shown by the dotted lines n, Fig. 5, inasmuch as that its rearend terminates in a tension-plate s the forward end of which is providedwith a V-shaped recess .9 The outer marginal edge of this recess 3 isbeveled down to afeatheredge at the under surface, its inner marginaledge being of the same bevel reversed, and the shaft is wider and is ofthe same width from the shoulder to the tension-plate The tension-plates is placed a sufficient distance from the face of the shuttle toprevent it fromcoming in contact with the thread during its passage fromthe hole 5 to the slot 8 as it is not intended that the plate 5 shallinterfere with the thread in any manner or at anytime, except at thefinishing of the stitch. To place the shuttlein Working condition,the 7ocop d is placed in the shuttle, the perforated disk thereof being at theheel of said shuttle, and the thread 8 drawn from the vent e and passedout through the hole 8 and in through the slot 3 and, if the thread isof the finest quality, out through the hole 5; if of the coarsest,through the hole nearest the shoulder 5 and under the guard 3 as shownin Fig. 1.

The operation of this device is as follows: lVhen the shuttle has passedthrough the needle-loop and is being drawn back, the thread is drawnforward and is free from tension, the friction of its passage throughthe holes .9 and 8 being sufficient to prevent it from passing out toofreely, and when the shuttle is again sent forward the thread is ledback by the action of the guard s and under the plate 5 where it comesin contact with the feather-edge s of the recess 8 and is drawn go intothe center of said recess and under the bearing of said plate, and isthus placed under tension. When the shuttle is again drawn back, theouter marginal edge of the plate .9 is rounded from the under surface insuch 5 proportion that the thread is thrown out thereby and again comesin contact with the edge 5" and by the reversed action thereof is sentout from under the tension, which action releases it from tension. Caremust be taken to place the hole 8 in the rear of the disk of the cop toprevent the wear thereof by the friction of the passing thread. The hole5 may be substituted by a slot cut in the upper side of the heel andextending inwarda trifle beyond the interior surface of the shuttle, asshown by the dotted line .9 Fig. 5. \Vhen threading the shuttle, caremust be had to place the finest grades of thread in the first hole 5' ofthe series a and in the next hole as the thread becomes coarser, for thereason that the nearer the thread approaches a straight line in itspassage through the shuttie the less the friction in its passing, and itis for this purpose that the slot sis intended, and as thecoarserthreads are the least pliable the farther they are threaded fromthe slot .9 the better, inasmuch as there will be less friction and aconsequent smoother tension. Nor must the thread be passed through morethan one of the holes, as they are simply intended to place a slightfriction on the thread to prevent it from passing from the shuttle toofreely, and thus cause an overplus thereof; but it is imperative thatthe friction be reduced as much as possible, especially in longstitches, for the reason that the thread required for a stitch twoinches long will pass out of the shuttle sixteen to one quicker thanfora stitch that is an eighth of an inch in length.

It will be understood that these changes in the construction of theshuttle do not interfere in any manner with any of the other parts orprevent the use of the ordinary bobbin, which may be placed therein inthe usual manner and the thread passed out through the hole 5* and underthe thread-guard s, as shown in Fig. 5. It will also be noted that theimprovements herein described can be placed on cylinder shuttles asreadily as on the class herein named by simply removing the ordinarytension and substituting therefor the tension herein described. Thethread,

however, is not repassed into the interim-,but

is passed out through the hole in the heel and through a small eyeletplaced at mid-length on the exterior surface of the shuttle and outunder the guard.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A shuttle for sewing-machines, provided with a cop that gives out thethread from the center and with a hole in the heel for the passage ofthe thread therefrom, located between the perforated end of the cop andthe interior surface of the end of the shuttle, and a threadguard on theoutside of the shuttle, having at its rear a tension-plate bearing onthe shuttlebody, whereby the thread is held under tension at and duringthe finishing of the stitch and is practically free from restraint atother times, substantially as set forth.

2. A shuttle for sewing-machines, provided with a cop d, having thecentral vent e for the exit of the thread, the said shuttle having thehole 3 in the heel thereof, the slot 5', and the series of holes a, allfor the passage of the thread, and the thread-guard 8, having at itsrear the tension-plate 3 provided with the V-shaped recess 3 whereby thethread is drawn in and held under the tension-plate at and during thefinishing of the stitch and is led out from under the tension-plate andleft practically free from restraint at and during the formation of thestitch, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM DUOHEMIN. \Vitnesses:

LENDELL A. CONNER, J r., ARCH. M. CATLIN.

